This is the final report on a program to design, construct, and test a high power, G-Band TWT capable of amplifying multiple signals while minimizing any mixing products which results from non-linear operation. The approach is to operate the tube backed off from saturation to fulfill the distortion specification and incorporate a four-stage depressed collector to enhance the efficiency. One experimental model of the 673H was produced. Details of the designs of the electron gun, coupled-cavity interaction circuit, and multi-stage, air-cooled collector are presented. Preliminary electrical performance data were obtained. (Author)

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